A tiny piece of the Moon is embedded in this stained glass masterpiece.

Home to items never before seen by the public.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The world's longest known cave system.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Take a drunken tour inside the world's largest known geode.

This grave marks the final resting place of pioneer John Chapman, better known as Johnny Appleseed.

This stately clubhouse has showcased German-American culture for over a century.

A giant lumpy candle serves as a beacon for this highly scented pit stop.

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

The highest point in Indiana is curated by an Eagle scout but may be in danger of losing its record to a nearby garbage pile.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

You thought Santa Claus didn't exist, but it turns out you were wrong.

The only freestanding table rock formation east of the Mississippi.

The longest navigable underground river in the United States is home to countless blind and albino animals.

130 replicas of world wonders squeezed into just 118 acres of space.

The final resting place of 19th-century sailors previously banned from being buried within Portuguese Macau.

270 million year-old forest of stone.

The most famous location in China was home to whole dynasties worth of imperial rulers.

Two dozen rescued bears roam (mostly) free at the largest bear ranch in the U.S.

"The Most Boring Road in the State."

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.